Can anyone suggest where I can find a calculator for the inductance per foot of copper tubing compared to the same length of copper bar or strip? I'm looking to understand the potential utility of us
Try http://www.k7mem.150m.com/Electronic_Notebook/inductors/wire_strip.html For a strip not over a ground plane, just set the height/thickness to some large distance (like 36 inches). Select the Indu
I don't know about the inductance, Pete, but my understanding is that soldered connections are not a good idea -- a lightning surge can melt the joints. I think you would need to use a mechanical cla
My tower has had a number of direct lightning strikes and I have never seen a soldered connection fail. I am assuming that Pete is referring to using copper water pipe or refrigeration tubing as a gr
That's not how solder joints fail. Solder has a higher resistance than copper so it drops more voltage due to any current through the connection. Ironically, the better the copper conductor, the more
I thought he might be thinking about using copper pipe instead of straps to connect the tower to the ground system. From what I've read on the subject, those joints should not be soldered. An in-shac
I keep seeing "solder melting" - and I have what is probably a very very silly question - What about "Hard" solders like Sil-phos or "Hard" Silver solder? You know, the stuff that takes a Mapp Gas (o
I used copper pipe because strap wasn't available cheaply here. I knew not to solder it, solder melting temp too low anyhow, so I brazed it. Seems to do the trick just fine. B0b I thought he might be
I'm no expert, but I would imagine stuff like that would work. But given the requirement for what is basically welding equipment, I think it would be cheaper and easier to use a mechanical clamp or e
I have also read that you should use a mechanical connection for the tower ground and I'm sure that it's good advice, however I have never seen the solder melt on any of my outdoor hardline connectio
Dick, About what I figured, except I already have the welding gear ;) Charlie -- 73 de KG2V For the Children - RKBA! Back Up My Hard Drive? I Can't Find The Reverse Switch! __________________________
I know the "current wisdom" has been not to solder although code IIRC only says that about the ground rod. Looking at the required currents, if the current is high enough to melt solder on the statio
I know the reputation for copper being hard to drill/tap, but I've never found it that bad. Particularly with tapping, I'd make sure I was only trying to do say a 60% thread or so. What I have NOT tr
I received several inquiries off-list, so I'll summarize some of the answers here, instead of replying individually: No, you can't just multiply the inductance of one foot of wire by ten to find the
AWG 6 is .162". Assuming you're talking pipe that's 0.5" in diameter (not half inch pipe, which is actually .625 inch OD), that's a diameter ratio of 3:1, for an impedance ratio of 1:1.2, which is pr
Jim, A good approximation is to consider a right angle bend as a 1/4 turn coil with the same radius of the bend. But the typical coil inductance calculators make too many simplifying assumptions to h
Can you give us more details on what you mean here or a citation from a text book? AFAIK, inductance is proportional to length, assuming the whole length is the same distance from ground, as long as
I don't know how "free space" inductance is defined, but these numbers correspond to a characteristic impedance of 148 to 288 ohms, hardly free space. A 1 inch wire 10 feet high over ground would hav
Correction: A 1 inch wire 10 feet high over ground would have considerably MORE inductance... Rick N6RK _______________________________________________ _______________________________________________